A US woman who shot and killed her husband and two adult children before taking her own life is thought to have committed the shocking crime as a result of being ostracised from the religion she was raised in.

A federal judge sentenced a former Arkansas judge Wednesday to five years in prison — a stiffer punishment than prosecutors recommended — after he admitted giving young male defendants lighter sentences in return for personal benefits that included sexual favours.

Every time I tell a mate I’m doing a story on cryptocurrency, they invariably ask me the same two questions: should they invest their own hard-earned money, and which cryptocurrency will get them a Lamborghini/yacht/island quickest?

In a 60 Minutes online exclusive, reporter Liz Hayes quizzed Australian Prime Minister Malcolm Turnbull on his relationship with the unpredictable Twitter aficionado and US president Donald Trump ahead of their meeting at the White House Friday.

Foreign investment rules under review

Prime Minister Malcolm Turnbull says foreign investment rules are under review but that's not because of regret over the lease of Darwin's port to a Chinese company.

Under existing procedures, sale or lease of assets to foreign investors by states or territories were exempt from consideration by the Foreign Investment Review Board.

"The reason we are reviewing the rules is not because we regret the decision made. Clearly, it makes sense for all foreign acquisitions of the relevant size to be subject to the same process," he told reporters in Darwin.

The NT government's decision to lease the port to the Chinese-owned company Landbridge for 99 years for $506 million has prompted an outcry about a Chinese interest controlling an Australian strategic asset.

There was no requirement for the Foreign Investment Review Board to assess the deal.

Mr Turnbull said the NT government still did the right thing, conducting its own inquiry and consulting defence which concluded it had no concerns.

He said Treasurer Scott Morrison was canvassing states and territories on whether FIRB should also consider their deals.

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"Clearly, it makes sense for all foreign acquisitions of the relevant size to be subject to the same process," he said.

"That is purely an orderly administrative thing to do, to make sure that there aren't gaps in the law."

Labor defence spokesman Stephen Conroy said the government failed to properly assess this deal and failed to notify a close ally, the US, which had genuine concerns.

He said state and territory governments should not be able to sell strategic assets to foreign governments without federal government oversight.

"I'm very concerned about the next major infrastructure asset which has strategic value, which is the TransGrid network in New South Wales which has a fibre optic network included in its assets which services defence bases and defence data centres," he told ABC radio.

Senator Conroy said such decisions on national interest grounds were normal.

Under Labor, Chinese telecommunications giant Huawei was barred from bidding for work on the National Broadband Network.